resumo
In this paper, the blue-light-emitting Sr2CeO4 phosphor powders were prepared by hydrothermal combustion reactions and a subsequent sintering process. During the process, the mixed urea and glycine were both used as leavening agent and fuel. The particle crystallization, surface morphology as well as the luminescence intensities of the Sr2CeO4 phosphor powders were effectively improved by adjusting the amount of glycine and post-sintering temperatures. The Sr2CeO4 phosphor exhibited strong crystallization and well-distributed spherical particle after optimization. Moreover, the intense blue-light emission band with the maximum at 468 nm in the range of 400-600 nm was observed as excited with ultraviolet light 277 nm. In particular, after the precursors were heat-treated at 1100 degrees C, the samples could be well-excited around 350 nm. The excitation bands were ascribed to the charge transfer from O to Ce, and the enlarged excitation range may facilitate its uses in optoelectronic fields.
palavras-chave
LUMINESCENT MATERIAL; FIELD; NANOPHOSPHOR; TM; LN
categoria
Materials Science
autores
Yang, YF; Zuo, XY; Shi, SK; Li, JB; Wang, JY; Geng, LN; Fu, LS
nossos autores
Lianshe Fu
Investigador Auxiliaragradecimentos
This work was financially supported by Natural Science Foundation of Hebei Province (Grant No. E2015205159), China, Science Foundation of Hebei Education Department (Grant No. ZD2014045), China, High Level Talents Foundation in Hebei Province (Grant No. C201400327), China, and the Science Foundation of Hebei Normal University (Grant No. L2013K02), China. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.